2. Non-physiologic hyperbilirubinemia: (1) positive Coombs test and (2) hematocrit < 5th percentile for GA (see Jopling J, Henry E, Wiedmeier SE, Christensen RD, Reference. Ranges for Hematocrit and Blood Hemoglobin Concentration During the Neonatal Period: Data From a Multihospital Health Care System. Pediatrics 2009; 123(2):e333 -e337.) and (3) ABO or Rh incompatibility.